Track spike



FIG. 1 is a top front perspective of a track spike showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is a second side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The unshaded regions, demarcated by broken lines, represent unclaimed subject matter and form no part of the claimed design. 

CLAIM The ornamental design for a track spike, as shown and described. 